MILITARY INTELLIGENCE SERVICE, WAR DEPARTMENT, Washington DC, SPECIAL SERIES No. 21 German Mountain Warfare, February 29, 1944
"The Germans believe that specially trained mountain troops (Oebirgstruppen) may influence decisively the outcome of a campaign, for mass armies must rely on specially trained small forces to secure their advance through the broader mountain valleys in order to reach the flat, where the decision usually is sought. Small forces of mountain troops can prevent, impede, harass, or channel the movements of the main enemy force through the valleys, so that when the decisive battle takes place in the flat, the enemy's power is spent and he is compelled to fight under the most unfavorable conditions. When on the offensive, mountain troops can cover and protect the advance of their own main force, enabling it to reach terrain of its own choice in the highest state of readiness for combat. Thus their mission on the offensive is to secure the route for the advance of large units through the valleys, whereas their mission on the defensive is to deny the valleys to the mass of the enemy forces. In either case, mountain troops must gain control of the mountains."